Vernier dial



M. SINGER vfinuma DIAL Nov. 10 1925- Filed Dec. 20, 1924 lNVENiIOR .flfarcos Sayer;

*IT U I Ea-S E Patented Nov. 10,-

PATENT OFFICE.

runcos smena, or "aromas, mrw You.

i VE BNIEB DIAL.

Application filed liecember a0, 1924. Serial no. 757,110.

. To all whom it may concern:

Be it knownthat I, MARCOS SINGER, a citizen of the United States, and resident of Yonkers, \Vestchester County, State of New .York, have invented certain new and usefulof which wherebyafine adjustment'or tunin may be obtained for the resistance or in uction coils, or-for the condenser plates.

'flI

It is the primary object and purpose of my present improvements to provide avernier for a condenser, variocoupleror variometer of a radlo receiving apparatus,

' which is so constructed that the necessary adjustments may be easily and quickly made to repeatedly bring or une in a desired station, at the same dial reading, and which permits of the use of the device in connection with radio apparatus of the numerous makes new in general use, without involving material structural alterations, thereof. It is a further general object of the ini vention to provide a radio Vernier, the sevoral parts of which are of exceedingly sim- .ple construction so that the device may be manufactured and sold at a comparatively low cost." a

- With the above and other objects in view, the invention consists in the improved vernier and in the form, construction and relative arrangement of its several parts as willbe hereinafter more full described, illustrated in the accompanying drawings and subsequently incorporated in the subjoined claims. I

In the drawings, wherein I have illustrated one simple and practical embodiment of the invention, and in which similar reference characters designate corresponding parts throughout the several views,

Figure 1 1s an elevation showing my improved vernier dial as applied to the insulating panel and coupler orcondenser shaft of a re io apparatus, Figure 2 is a vertical sectional view taken on the line 2-2 of Figure 1,

Figure 3 is a detail elevation of the dial 3.13m,

Figure 4 is a detail view of one of the parts, and

Figures 5 and 6 are detail views illustrating the Vernier adjustment means.

Referring in detail to the drawings, 5 designates the front panel of the cabinet or case for the radio apparatus, through which the shaft 6 of the variocoupler, variometer or condenser, as the case may be, extends. This .shaft end isgsecured in a bushing 7, which is rotatably mounted in said panel, by means of the set screw 8, said bushing being fitted through an opening provided in a dial plate 9, which is suitably fixed to the face ofthe panel 5, as by one or more-screws indicated at- 10.

The dial plate is of substantially semik 'circular form and the curved perimeter thereof is outwardly flanged orofl-set from the face of the panel-5 as shown at 11. The surface of this ofi-set flange iscalibrated,

as shown at 12.

To the outer end of the bushing 7, the

lower end of an arm 13 is fixed, said arm being spaced from the dial plate 9 and parallel therewith, and extendin beyond the calibrated flange 11. The en of said arm is inwardly and. downwardly bent around the edge of the flan e 11 and extends between said flange an the face of the panel 7 5, as shown at 14, thereby providing a guide for said arm and preventing its displacement out of ali nment with the dial. The

arm 13 is provi ed with a longitudinally extending slot 15 for a purpose which will be presently explained, and at the outer end ofsaid slot, said arm is provided with an inwardly projecting index spur 16, for movement over the calibrations 12 on the dial flange 11. A slide member 17 is longitudi nallymovable in the slot 15 and is provided with an opening 'therethrough in which a shaft 18 is looselyengaged. The slide 17 is formed on one end with a'flan e 19 engaging upon the inner face of t e arm 13.

Upon the outer end of the shaft 18 an operating knob 20 of suitable form is secured as by means of the set screw 21 and the inner end of said shaft is formed with an eccentric end portion 22. Between this eccentric end portion of said shaft and the flange 19 of the slide 17, a leaf spring 23 is interposed and normally acts to hold the shaft 18 against outward axial movement and retain said eccentric end 22 of said shaft in any one of the spaced radially extending series of openings 24, which are formed in the dial plate 9 in alignment with spaced calibrations 12.

The knob 20 at its inner end is also pro- 'vided with a vernierdial 25 which has a through subcurvilinear edge extendin upon its outer.

stantiall -90, and provide .face wit the relatively fine calibrations indicated at 26. These calibrations are adapted to be read in conjunction with a longitudinally extendin index line 2'? on the face of the arm 13, said line being-bi-sected'by.

the curve spaced lines 28, the spacing of these lines corresponding with the radial pacing. of the openings 24: in the dial plate 9;

In'the operation of the device above described, the general adjustment is first madeby pulling outwardly on the knob 20 torelease the eccentric end 22 of the shaft 18 from connection with the dial plate v9, and then shifting the arm 13 over the face of the dial plate, in which movement of said arm, the shaft .6 is of course rotated. When the index spur 16 of the arm registers with the desired calibration 12 in-line with one of the series of openings 24, the knob 201s parted to the arm 13 which likewise causes a further rotation of the shaft 6 to the ex-. tent determined by the movement of the dial plate 25. The extent of such rotation of the shaft 6 for the purpose of securing a liner adjustment, in proportion to the movement of the dial plate 25 may be varied by shift ing'the shaft 18 and said dial plate longitudinally along-the arm 13 so as to engage the eccentric end of said shaft in a selected opening 24. at a predetermined distance from'the shaft center. In this longitudinal adjustment of the dial plate upon the arm, the registration of the curved edge of said plate with one of the horizontal lines 28 extending across the index line 27, determines when the eccentric end of the shaft 18 is in .properposition to register with the opening 24. In this manner, it will be evident that e very fine Vernier or micrometer adjustm nt of the condenser,.var1ometer or var1ocoupler,

as the case may be, may be very quickly secured. in practice, I propose to form the dial plate 9. from such materials, or to pro vide said plate witha surface of such charactor that it-may be written upon. Thus,

the user can note beside the proper opening 24, the reading on the Vernier dial plate 25,

in conjunction with the symbols of the send-.

ing or broadcasting stations, which is in tune w1th the recelvmg'apparatus at that 7 means yieldingly urging1 particular adjustment, and thereafter he can, at any time, tune in the same station by adjustlng the dial to the indicated position. v

While 1 have in the accompanying draw- .ing's, indicated a certain number of the radial lines or openings 24, and a certain s acing of the same in a dial plate, it Wil be understood that the number of such openings may be decreased or increased, as may be found desirable, and the area of the vernier' dial plate 25 and'the number of calibrations. thereon can likewisebe varied tosecure any desired fineness in. the adjustment thereof.

From the foregoing description, considered in connection w1th the accompanying drawings, the constructionand manner of operation of. my improved vernier dial will be-clearly and fully. understood. The several parts as herein described may be easily produced at a nominal cost so that the device, as a Whole, can inexpensivelymanu factured.

It will also be noted that the use of my improved vernier dial involves -no alters tions of a material character in radio apparatus, to which it may be applied, and that such application can be readily made to existing radio receiving apparatus by the indiv dual owner without requiring the services of a skilled radio mechanic. Although I have herein referred to a construction and arrangement of the several parts of my invention, which I believe to be quite desir able, it will nevertheless be understoodthnt the device is susceptible of construction in various other alternative embodiments and I' therefore reserve the privilege of resortin to all such legitimate chan s in the detail features thereof as may 7 bodied Within the spirit and scope of the invention as claimed. I claim 1. In a. Vernier dial, a

dial plate lit? having a calibrated surface, an arm connected at one end to the part to be adjustedand having an index at its other end movable over the calibrated surface of said dial, a vernier dial, means for mounting said vernier dial for longitudinal adjustment on said arm,-- said means includin a shaft in fixed relationto said vernier ial and adapted to be rotated to adjust said;

said shaft axially dial with respect to an index on said arm,

into ens ement wi e main dial plate,- and sai ial piste and shaft having means to coact many one of the ad usted positions ofsaid'vernier dial, whereby, upon rotation of the latter dial with res act to the index on said arm, a further a justment of said arm with respect to the main dial plate is obtained.

In a Vernier dial, a main d al Pl e havin a calibrated surface, an arm connecte at one end to the part to be adjusted and having an index at its other end movable over the calibrated surface of said dial, a Vernier dial, means for mounting said vernier dial for longitudinal adjustment on said arm, saidmeans including a shaft in fixed relation to said Vernier dial and adapted to be rotated to adjust said dial with respect to an index on said arm,

I means yieldingly urging said shaft axially into engagement with the main dial plate, said main dial plate having a plurality of series of radially extending spaced end slidably engaged with said flange and provided with an index spur moving over the calibrations thereon, a vernier dial plate adjustable longitudinally along said arm and rotatable with respect thereto, and means for imparting a further adjustment to said arm upon said first named dial in the rotation of said vernier dial plate.

4. In a Vernier dial, a main dial plate adapted to be fixed to a panel and having an off-setcalibrated flange, an arm fixed at one of its ends to a shaft rotatably mounted on said panel and slidably engaged at its other end with said calibrated flange for movement thereover in the initial adjustment of said shaft, a rotatable Vernier dial plate carried by said arm, and means fixed for rotation with said vernier dial plate and coacting with means on said first named dial plate to impart a further movement to the arm over the latter dial plate and obtain a finer adjustment of said shaft.

5. In a vernier dial, a, main dial plate adapted to be secured to a panel, and having an off-set calibrated flange, an arm adapted to be fixed at one of its ends to a shaft mounted in said panel, the'other end of said arm extending around said flange and guided thereby, said arm having an index for movement over the calibrations of said flange, a'shaft and means for mounting said shaft on said arm for longitudinal and rotative movement, a vernier dial fixed on said shaft, said arm having an index line with respect to which the calibrations on said latter dial are adapted to be positioned, and said first named dial plate and said shaft having means to coact in any one of the adjusted positions of said Vernier dial to impart a further movement of said arm in the rotation of said shaft and obtain afiner adjustment of said first named shaft.

6. In a Vernier dial, a main dial plate adapted .to be secured to a panel, and having an off-set calibrated flange, an arm ada ted to be fixed at one of its, ends to a mounted in said panel, the other .end of said arm extending around said flange and aft guided thereby, said arm having an index for movement over the calibrations of said flange, a shaft and means for mounting said shaft on said arm for longitudinal and rotative movement, a Vernier dial fixed on said shaft, said arm having an index line with respect to which the calibrations on said latter dial are adapted to be positioned, said first named dial plate having a plurality of radially extending series of openings therein and said latter shaft having an eccentrically oft-set portion to engage in said openings, and a spring yieldingly urging saidshaft axially towards the first named dial plate, said eccentric shaft portion coacting with said dial plate in any adjusted position of said Vernier dial to impart a further movement tosaid arm in the rotation of said shaft and thereby obtain a finer adjustment of the first named dial.

In testimony that-I claim the foregoing as my invention, I have signedmy name hereto.

I MARCOS SINGER. 

